润滑与密封
潤滑與密封
윤활여밀봉
LUBRICATION ENGINEERING
2015年
3期
40-46,68
,共8页
摩擦因数%渐开线圆柱齿轮%流变模型%压黏关系%弹流润滑%载荷分担
摩抆因數%漸開線圓柱齒輪%流變模型%壓黏關繫%彈流潤滑%載荷分擔
마찰인수%점개선원주치륜%류변모형%압점관계%탄류윤활%재하분담
friction coefficient%involute spur gear%rheological model%pressure-viscous relation%elastohydrodynamic lu-brication%load-sharing
结合载荷分担概念和弹流润滑理论，研究润滑剂的流变性对渐开线齿轮油膜厚度、摩擦因数等润滑特性的影响；分别采用Carreau流变模型和Doolittle?Tait自由体积黏度模型描述润滑剂的剪切稀化特性及黏压关系，研究齿轮载荷、转速、表面粗糙度和润滑剂压黏系数对摩擦因数的影响。研究结果表明：不同的润滑剂剪切稀化特性不同，因此油膜厚度、油膜承载比例和摩擦因数均不同；摩擦因数随着转矩的增大先显著增大，当超过某一转矩值时，摩擦因数开始缓慢变化；摩擦因数随着转速的增加先显著减小，当转速增加至某一值时摩擦因数又随之增大；随着表面粗糙度和润滑剂压黏系数的增大，摩擦因数均明显增大。
結閤載荷分擔概唸和彈流潤滑理論，研究潤滑劑的流變性對漸開線齒輪油膜厚度、摩抆因數等潤滑特性的影響；分彆採用Carreau流變模型和Doolittle?Tait自由體積黏度模型描述潤滑劑的剪切稀化特性及黏壓關繫，研究齒輪載荷、轉速、錶麵粗糙度和潤滑劑壓黏繫數對摩抆因數的影響。研究結果錶明：不同的潤滑劑剪切稀化特性不同，因此油膜厚度、油膜承載比例和摩抆因數均不同；摩抆因數隨著轉矩的增大先顯著增大，噹超過某一轉矩值時，摩抆因數開始緩慢變化；摩抆因數隨著轉速的增加先顯著減小，噹轉速增加至某一值時摩抆因數又隨之增大；隨著錶麵粗糙度和潤滑劑壓黏繫數的增大，摩抆因數均明顯增大。
결합재하분담개념화탄류윤활이론，연구윤활제적류변성대점개선치륜유막후도、마찰인수등윤활특성적영향；분별채용Carreau류변모형화Doolittle?Tait자유체적점도모형묘술윤활제적전절희화특성급점압관계，연구치륜재하、전속、표면조조도화윤활제압점계수대마찰인수적영향。연구결과표명：불동적윤활제전절희화특성불동，인차유막후도、유막승재비례화마찰인수균불동；마찰인수수착전구적증대선현저증대，당초과모일전구치시，마찰인수개시완만변화；마찰인수수착전속적증가선현저감소，당전속증가지모일치시마찰인수우수지증대；수착표면조조도화윤활제압점계수적증대，마찰인수균명현증대。
Study on the friction coefficient of the tooth surface plays an important role on reducing friction loss and im?proving the system transmission performance.The effects of the rheological behavior of lubricants on the film thickness and the friction coefficient along the line of action of involute spur gear were studied by employing the load sharing concept and elastohydrodynamic lubrication theory.Carreau rheological model was used to describe the shearing thinning behavior and the Doolittle’s free volume equation was used to represent the pressure?viscous relation.The effects of the load,rotational speed and surface roughness of gear and the pressure?viscous coefficient of lubricants on the friction coefficient were also studied,and comparisons between the results from two different lubricants were given. The results show that shearing thinning behavior affects the oil film thickness,the oil film load scaling factor and the friction coefficient significantly.The torque,rotational speed and surface roughness of gear and the pressure?viscous coefficient have a great influence on the friction coefficient. With the increasing of input torque, the friction coefficient firstly becomes larger dramatically, then changes slowly as the torque exceeds a certain value. As rotational speed increases, the friction coefficient is firstly de?creased evidently,then becomes larger at a certain rotational speed.The friction coefficients are all increased along with the increasing of the surface roughness of gear and the pressure?viscosity coefficient of lubricants.
